現今流行的網路串流，Apple HTTP Live Streaming，其缺點無法隨著客戶端與伺服端的頻寬變化，提供相對應的位元率，導致使用者觀看品質不流暢。所以此篇論文是希望能解決以上遇到問題，能利用動態編碼和頻寬管理，達到即時影像可依據頻寬變化，而會改變輸出的影像品質，先以求達到流暢播放為目的，而後求保持最大頻寬使用量下，提供最高的播放品質。

The most popular Internet live streaming technique, Apple HTTP Live Stream, which causes that users suffer from the consistency in bitrate when the bandwidth between the user and the server varies. Thus, this article solves the issue mentioned previously. The method we conduct makes use of adaptive transcoding technique and bandwidth management approach in order to achieve the goad that the video stream quality varies in according to the bandwidth change. We have the stream fluency the major consideration while the maximum bandwidth utilization the minor to assure the highest video quality.

目錄
目錄 III 
圖目錄 V 
表目錄 VI
第一章 緒論 1
1.1 研究動機 1
1.2 研究架構 2
第二章 背景研究 4
2.1 串流種類 4
2.1.1 隨選視訊 4
2.1.2 即時串流 5
2.2 串流技術 6
2.2.1 傳統串流技術 6
2.2.1.1 RTSP/RTP的串流方案 7
2.2.1.2 HTTP漸進式下載 7
2.2.1.3 RTSP/RTP和HTTP漸進式下載差異 8
2.2.2 自適式串流技術(HTTP Adaptive Streaming) 9
2.2.3 HAS技術特點分析 10
2.3 影像壓縮技術 11
2.3.1 MPEG-1 12
2.3.2 MPEG-2 14
2.3.3 H.264 15
2.4 Adobe Flash Dynamic Streaming 17
2.5 Microsoft Smooth Streaming 18
2.6 MPEG Dynamic Adaptive Streaming over HTTP 19
2.7 Apple HTTP Live Streaming 20
2.7.1 M3U8播放清單 23
2.7.2 HTML5和FLASH 24
2.7.3 字幕檔(WebVTT) 25
第三章 Adaptive Transcoding HTTP Live Streaming System 27
3.1 理論基礎 28
3.1.1 頻寬偵測 28
3.1.2 動態調節演算法 29
3.1.3 編碼壓縮模型 30
3.2 實作 33
3.2.1 系統環境架設 33
3.2.2 系統流程 34
3.2.3 FFmpeg 37
3.2.4 動態編碼 37
3.2.5 影片字幕 37
3.2.6 偵測頻寬 38
3.2.7 HLS伺服器 39
3.2.8 資料庫設計 39
3.2.9 介面設計 40
第四章 功能分析與效能比較 42
第五章 結論與未來研究 44
參考文獻 45
附錄-英文論文 48

圖目錄
圖2.1: 常見MPEG格式 12
圖2.2: DASH運作示意圖 20
圖2.3: HLS架構圖 22
圖2.4: M3U8格式 23
圖2.5: M3U8索引檔 23
圖2.6: WebVTT字幕檔 25
圖2.7: WebVTT在HTML5格式 25
圖3.1: 第一版編碼模型 31
圖3.2: 第二版編碼模型 32
圖3.3: 第一版程式流程圖 35
圖3.4: 標準HLSM3U8播放清單 35
圖3.5: 動態產生M3U8檔程式碼 36
圖3.6: 動態產生M3U8流程圖 36
圖3.7: HLS字幕標籤 38
圖3.8: 動態產生字幕程式 38
圖3.9: 客戶端介面 40
圖3.10: 讀取資料庫資料顯示於介面上 41

表目錄
表2.1: H264規格表 16
表3.1: 第一版編碼模型參數 31
表3.2: 第二版編碼模型參數 32
表3.3: media_list表格 39
表4.1: 各串流技術比較 42
表4.2: HLS測試時間 43
表4.3: AHLS測試時間 43

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